package com.moxiao.yfjh.module.blind.common;

import org.springframework.stereotype.Service;

import java.util.Calendar;
import java.util.Date;


/**
 * @version 1.0
 * @Author zhk
 * @Date 2024/1/11 11:45
 **/
@Service
public class CommonUse {
    /**
     * 根据出生日期计算年龄
     * @param birthDate
     * @return
     */
    public Integer countAge(Date birthDate) {
        // 当前日历
        Calendar nowCalendar = Calendar.getInstance();
        // 生日大于当前日期
        if (nowCalendar.before(birthDate)) {
            throw new IllegalArgumentException("The birth date is before current time, it's unbelievable");
        }
        // 当前年月日
        int yearNow = nowCalendar.get(Calendar.YEAR);
        int monthNow = nowCalendar.get(Calendar.MONTH);
        int dayNow = nowCalendar.get(Calendar.DAY_OF_MONTH);
        // 出生日期年月日
        Calendar birthCalendar = Calendar.getInstance();
        birthCalendar.setTime(birthDate);
        int yearBirth = birthCalendar.get(Calendar.YEAR);
        int monthBirth = birthCalendar.get(Calendar.MONTH);
        int dayBirth = birthCalendar.get(Calendar.DAY_OF_MONTH);
        // 粗计算年龄
        int age = yearNow - yearBirth;
        // 当前月份小于出生月份年龄减一
        if (monthNow < monthBirth) {
            age--;
        }
        // 当前月份等于出生月份，日小于生日年龄减一
        else if (monthNow == monthBirth && dayNow < dayBirth) {
            age--;
        }
        // 返回年龄值
        return age;
    }


}
